freeman



Sept. l5, 1959 H. H. FREEMAN 2,904,754

GALVANOMETER SUPPORT Filed July l1, 1955 2 Sheets-Shea*l 1 1 F/GJ. 28 34 50 4@l /2 INVENTOR. HOLLA/VD HEDGES FREEMAN ATTORNEYS Aaiifmi .APPlicaflon illy ll .15955, 5.2.1.988

This invention relates to galvanometer Suppl-)$152431 has -particlr refere'neefito apli'a't'uls" for :sipporting miniatue galvanometesjin arriagnete lt is "eoninnoninaeiee 'to ,liillne .n .number ofv nliniaane aahfaIwiaete'r-Sv ai .eoninonente 'in reeending .oeeillhgraphe and the like? 'Eaeh' nainiahlne'salvanometer T r, lina;r'i.ly inelh'des a'eoil-and-lnifor alfanjgenie. .Y amended ineine ,a'eaee lay a. .Pah ef. 'iih'hona ser' when',r naif. foi Y.Pole Pieeee 'extending throligh the front Side. and. .the hack aide of the ease 'feepeeiivelyf and a. Winslow in the .front Side 'of the ealvanerneter .ease for .transmitting .lightfto and'fromtlie'galvanorneter mirror. v "In neeondingioaeillognanhe .eleelneal' signal teren .iejapnlied thnongh "ihe'eoil of a al 'alleineN n lnegalvanonleten ie enpporfefl in' a. ineen tie nel@ that its. nii of will'lelleefanannlef' Prolaortionalliolhe aPRlie lisht'thronah ,the galvanonleter window .aal onto minor, 'and Ythe light .is 'ieileeled :by .the mirror throngla an ontioalpeya'tenito prodliee a nace onpliotosensitive bapen'inaeeoxdanoewiilh hh 0f moyemeni- :Sinee the anometer nnrror, alla?? .0fhlliieel system, ite 12o/.tion and orientation via important .and farther" when .a nnrnhef of '-.g'alvanometere 'are need tov reeofrd a plnrality of traeee, .on Photosenel'tive gener., .the problem of'aoeiirately .positioning the aalvanonleiera he- 'eomes'dinicuit Uanally a'mennline hleell ie. emol...ye l .to enpport the .galvanonleters'in a magneti d the In nntin''hlo.el `;having .a plnrality .Slo w `neeellve the Ple -lieleee 'of ,al'vanonieterayan forage. trolling the frward'and Backward tilt of each 'galvanomf eten .Eaeh of the.v alvanllletene has a .hnlt-.in adinetdehnafiismig aeennalely ine' tif fthe. axiale?` the meanafoi'eontlolling; theV toward. and Y menta the balli-in dine;- 7gg# structure so that-fthey'f'm M v M ward t'o-orientvlthe reeetd irr 1age"f r1A thegalvanometrmirxoro.v .The conventional sprig'arrangeentvs' associated 'structure are `relatively yernplicat'e'd"and en@ pensive, yet'theyV permit the galvanoiriete'rs to .work 11p- Ivva'adly out -of Vpositionfin' VVresponse fo-'adjstments of ythe tiltedposition rm timeito time. l

The apparatusl of the invention substantially-sinn Plex; endless expensive than conventional gal'vanmeter supportapparatus;l anditfeliminatesllthepoblem ofvcreep- |'2,904,754 Patented Sept. 115, 1958 l CC i2 ing ofthe galvanometer upwardly in the slots. "111e 'apparatus of the invention xutilizes support means having slots -for supporting at 'least one galvanometer with the galvanometer being vfree to be tilted inI oneplane`` 'A plate means is connected to the Asupport means and it y has an edge which engages oneside ofthe galvanmeter aknife edge whieh. engageethe.. notches in for providing adetentaction and apivotyaxli'swfor the' gall;-A vanbmeter. lSpring meansl are onnected -to the support; means ifor engaging ithe opposite sidel of ltlie galvanm eter and inging thegalvanoineter ahont the :bivot and 'alhatalale nleehaniealnaeane .are eonneetesl te `the. aaneen 1neana .for engaging theeaid Yopnoeite .aideiof the. galvanolneler .and pivoting the .salvanenletei .ahontithe' Pivot anieesainattheaetion .of theelanngmeann.

In a .Preferred enihodhnent ofthe inviolationl ,tlieanr ne. .ineens inelndes a .linea enppore. bloei; having .anhin reilly .of Slots Snaeed along one .f 'aee .and .n.seeondi snp 'ont hloelehavhg a plurality of .Slots .Spaeed ,along o the eeeonsl annpon bleek .being disposed' .appa-o nnately Parallel to and 'al a dietanee flioni .thev .sup-pont bleek with the .reepeetife Sete .of Slots being. nispos'edta ine each other, forming a plurality of slot p` s for 'i orally ,reeeiving and Supporting .a corresponding' pl of eneaeefl ,gallfanonietera- Eaoh. of the'galvan haea nofeh'lafovided ia oneei'ele of its Th p Ineens is ,eonneeted .to .the nr; sappen bleek'. ...e reapleetlxe. eallvanemeief eases 'for 'providing a delen! .nl etionend.- 'al Dive? .anla for 'ihe'ealvanonaetere- The. adinetablenae: Chahieal means .inellnlee a pllnality .of lllngers .elifjlahly .ing the. ,reePeefiYe .galva'honaeiel .and Pl. tins. the. .aerea aholltthe pivot The spring vifa` eonneetell. to the .Seeond support bleek and I12s-sha ed like,

e. e9. b with a. top. plate and .a plurality of integral.. lenen germs whieh eevenally engagelheespeetive Yanorneter .eases andurge the 'eaSeS about-the. pinete.. again lhereeoeetive piangere The invention .is .enlalaine@l in .slet-ail `with relelfenae. il?Y th@ Pif-ifm@ tin-bedienen as .shown in the drawings, in. which;

".Fi'gl a top .View the meterte@ .embodiment of the. invention; n

Fig'. 2`is a View taken along 'line 2 2 of'Fig. Al Fine 3 i `enlanzed tragnnentary view taken area oiFig '2, W'th'lre' nnee to.y Pigs., l :2., a .niet nlppenvhlaelt 1Q. an eeoonglenpport bleek 12ans-aanmeten ies te poles of a ll-ehapesl. magnoa 11A' l., el" one@ parallel toeaelav other and eiaanaeel: n. distance apart'- a The first block is undercut asv shown at f1- 6.on-, itsigl proximate to. the seeond bleek leaning a orotnnlingfporn .nhljeh extendetowar-el'the feeeonelhloele Ag-falli@ ra 1y. of .eqnall spaeed vertieal alote-glleare-nt-throngh the. fonia/ending. eXteeInity-of the. pnot-nltlillglaalnien thne leaving a omnes.pending-V Illnrality of; v...tiealfteethl 22 which separate the slptsfrgmgone anptheg., n

A galvanometer down-stop plate 24 is conneeted vto ille llllleltellt Peillon of' the .rst .molmling bleek YbyV a .Pillflity.'Qfe'sclews.y 2 61 'The'v plate. has-.a `knife/edge "Q Si which protrude/s a 'smallfdistan'cehin iront ofethe plurality' of'teetho22in1alf'uniform manner transversely toith slots mangimi-engin ofthe block. g y

The second mounting blocl has a protrudingrprtiog.

i 34. The'slots'inthe second'mountin'g block are inline 3 with and face toward the slots in the rst mounting block, thereby forming a plurality of slot pairs. v

The protruding portion 30 of the second mounting block has a groove 36 cut along the length of its forward face directly beneath the plurality of teeth 34. Arspring plate 38, having a plurality of leaf springs 4G formed integrally therewith and depending from the plate like a comb, fits into the groove 36 and is held therein by pressure from a wedge-shaped plate 42. Each of the depending leaf springs is in line with a pair of vertical slots. of the respective pluralities of slots 20 and 32 and slopes downwardly in the direction from the second mounting block toward the iirst mounting block.

A plurality of channels 44 are cut in the top face of the second mounting block and in line with respective pairs of slots. A corresponding plurality of plungers 46 are slidably contained in the channels 44 by atop plate 48 connected to the second mounting block by a plurality of screws 50 which extend through the plate and connect to the block at positions intermediate the channels. Each plunger has a recess 52 in its top face which is in line withv a corresponding one of a plurality of openings 54 through the top plate. The location of the plungers may be adjusted by inserting a screwdriver or the like in the recess 52 so that the plungers may be moved forward or backward.

'Figs 2 and 3 show the operation of the apparatus of the invention. A rriiniature galvanometer 56 having a case 58, With a front pole piece 60 and a back pole piece 62 extending from the case, is inserted into a pair ofV 'corresponding slots in the mounting blocks. The pair of slots provides a tight fit for the pole pieces in the lateral direction but leaves the galvanometer free to be tilted in the plane of the slots. The galvanometer has a small notch 64 cut in its case transverse to and directly beneath the front pole piece. As the galvanometer is pushed down into the pair of slots, the knife edge of the downstop plate slips into the notch in the galvanometer case with its upper extremity preventing further downward movement of the galvanometer, and thus providing an accurate positioning of the galvanometer in the vertical direction. At the same time, a corresponding leaf spring of the plurality of leaf springs 4i) engages the lower part of the back side of the galvanometer case and urges the galvanometer to pivot about the axis formed by the knife edge of the down-stop plate, forcing the back pole piece against a corresponding plunger of the plurality of plungers 46.

As shown in dotted lines in Fig. 2 and in solid lines in Fig. 3, when the galvanometer 56 is inserted into the mounting blocks, the down-stop plate provides a detent action which prevents the galvanometer from working upwards, and the position of the corresponding plunger may be adjusted to pivot the galvanometer about the pivot axis provided by the knife edge of the down-stop plate against the action of the spring.

This structure provides a three-point contact and eliminates all play from the galvanometer in the plane of the slots. The simplication resulting from the -iise of a single down-stop plate and an integral comb-shaped spring substantially reduces the cost of the apparatus of the invention over conventional apparatus.

I claim:

l. Apparatus for pivotably supporting a plurality of miniature galvanometers each having a case With a notch disposed in one side of the case, said apparatus comprising support block means having a plurality of openings for receiving and supporting -the respective galvariometers so that the galvanometers are free to be tilted in one plane, a galvanometer down-stop plate connected to the support block means and having a knife edge disposed transversely of said openings which engages the notch in the respective galvanometer cases for proving detent action and acting as a pivot axis for the galvanometers, aplurality of springs connected to the support block means for severally engaging the respective galvanometers and urging the galvanometers about the pivot axis provided by the knife edge, and adjustable mechanical means connected to the support block means which adjustable means severally engage the respective galvanometer cases for pivoting the galvanometers about the pivot axis against the action of the respective springs, said springs and adjustable mechanical means engaging the several galvanometers on opposite sides of the pivot axis from one another and both in opposition to the knife edge.

2. Apparatus for supporting a plurality of galvanometers each having a case with a notch disposed in one side of the case, said apparatus comprising support block means having a plurality of slots for supporting the respective galvanometers, a down-stop plate connected to the support block means and having an edge which engages the notch in the respective galvanometer cases for providing detent action and a pivot axis for the galvanometers, a plurality of adjustable plungers connected to the support block means which plungers severally engage the respective galvanometer cases on one side of the pivot axis for pivoting the cases about the pivot axis provided by the down-stop plate, and means for spring loading the respective galvanometer cases on the opposite side of the pivot axis and against the action of the respective plungers,'both the plungers vandthe springs engaging the galvanometers in opposition tothe knife edge.

3. Apparatus for supporting a plurality of galvanometers each having a case With'a notch disposed in one side of the case, said apparatus comprising'support block means having' a plurality of slots for supporting the respective galvanometers with the galvanometers being free to be tilted in one plane, a galvanometer down-stop plate connected to the support block means and having a knife edge which engages the notches in the respective galvanometer cases for providing detent action and a pivot axis, a plurality of lplungers slidably connected to the supporting block means which plungers severally engage the respective galvanometer cases for pivoting the cases about the pivot axis provided by the knife edge of the down-stop plate, and a spring member connected to the support block means, the vspring member lbeing shaped like a comb with a top plate and a plurality of integral depending arms Which severally engage the respective galvanometer cases and urge the cases about the pivot axis against the respective plungers, the spring and the plungers engaging the galvanometers on opposite sides of the pivot ais from one another and both in opposition to the knife e ge.

4. Apparatus for supporting a plurality of galvanometers'each having a case, a front and a back pole piece protruding from the case and a notch in the front side of the case, said apparatus comprising a rst support block having a plurality of slots spaced along one face for receiving the front pole pieces of the respective galvanometers, a second support block having a plurality of slots spaced along one face for receiving the back pole pieces of the respective galvanometers, the second support block being disposed approximately parallel to and at a distance from the irst support block with the respective pluralities of slots being disposed facing `each other and forming a plurality of slot pairs for receiving the pole pieces of the respective galvanometers concurrently, a down-stop plate connected to the iirst support block and having a knife edge for engaging the notches in the front sides of the respective galvanometer cases to act as a detent and as a pivot axis, a plurality of plungers slidably mounted atop the second supporting block for severally engaging the back sides of the respective galvanometer cases at a position above the knife edge and pivoting the cases about the knife edge, and a spring member connected to the second support block, the spring member being shaped like a comb with atop plateand a plurality ofintegral depending arms. .which severally engage the knife edge against the respective plungers.

References Cited in the le of this patent UNITED STATES PATENTS Palmer Dec. 30, 1941 6 Redmond Nov. 13, 1945 Washburn Aug. 12, 1947 Morrow Apr. 13, 1948 Hathaway May 3, 1949 Staff Oct. 16, 1951 Richardson June 10, 1952 Hathaway Dec. 28, 1954 UNITED STATES PATENT OFFICE CERTIFICATE OE CORRECTION Sepember l5 1959 Patent No. ZOZUVA Holland Hedges Freemen It is hereby certified that error appears in bhe-printed specification of the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

Column 3, line '73, claim l for nproving" read providing me Signed and sealed J@his lsiJ day yof Merch 3.96?e

(sEAL) Attest:

KARL HQCAXLINE ROBERT C. WATSON Commissioner of Patents Attesting Officer 

